Number System Practice Test 5

Question : 12 of 40

Marks: +1, -0

The numbers from 1 to 15 multiplied together. The number of zeroes at the right end of the product will be:

Solution:

1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 × 9 × 10 × 11 × 12 × 13 × 14 × 15

=2^10×3^6×5^2×7^2

×10^1×11^1×13^1

We get zero when 2 and 5 are multiplied.
So,

2^2×5^2×10

will give 3 zeroes.

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